As much as his partners, including Mikhail D. Prokhorov, the Russian billionaire who bought 80 percent of the team in 2009, are getting out of him, Jay-Z, whose real name is Shawn Carter, is benefiting handsomely, too, beginning with free use of one of 11 exclusive “Vault” suites, for which paying customers are charged $550,000 a year.

Suite owners will have access to a Champagne bar serving Armand de Brignac, an expensive bubbly that Mr. Carter promotes and in which he holds a financial interest, according to a biography by a writer for Forbes. The arena will contain a 40/40 Club, an iteration of his sports-bar-style nightclub chain. There will be a Rocawear store, selling his clothing line, on the arena’s exterior. Even the advertising agency used by the Nets, Translation, is half-owned by Mr. Carter.

All told, he has achieved a remarkable feat of leverage with his tiny sliver of the team, which was reduced from one-third to one-fifteenth of a percent upon Mr. Prokhorov’s purchase of the Nets, according to people aware of the deal terms.